TB18 Chìmài

Reviewed by · Licensed Acupuncturist & TCM Physician · Last reviewed June 2026

TB18 (Chìmài, “Chìmài”) is an acupuncture point on the Triple Burner Meridian. It is located posterior to the ear, on the mastoid process, within the hairline, at the junction of the middle and lower thirds of the curved line connecting TB17 (Yifeng) and TB20 (Jiaosun). The classics describe it as being located among the 'chicken-foot' like blue vessels behind the root of the ear. It calms fright and extinguishes wind, clears the head and benefits the ears, harmonizes the stomach and intestines.

Location

Posterior to the ear, on the mastoid process, within the hairline, at the junction of the middle and lower thirds of the curved line connecting TB17 (Yifeng) and TB20 (Jiaosun). The classics describe it as being located among the 'chicken-foot' like blue vessels behind the root of the ear.

Needling

Subcutaneous insertion 0.3-0.5 cun, often directed inferiorly or superiorly along the channel.

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TCM functions

Calms fright and extinguishes wind, clears the head and benefits the ears, harmonizes the stomach and intestines..

Indications

Head wind, tinnitus, infantile convulsions, epilepsy, tetany, vomiting, diarrhea, fright, fear, blurry vision, unclear vision..

Clinical notes

Chìmài is a key local point for ear disorders like tinnitus and a distal point for systemic wind conditions, especially in pediatrics. Its name, 'Spasm Vessel', highlights its classical application for convulsions, epilepsy, and fright. The classical emphasis on careful bloodletting suggests it was used to clear heat and pacify wind from the head.

On the Triple Burner channel

TB18 is one of 23 points on the Triple Burner Meridian. Nearby points:

TB14TB15TB16TB17TB19TB20TB21TB22

Frequently asked questions

Where is TB18 located?

TB18 (Chìmài) is located posterior to the ear, on the mastoid process, within the hairline, at the junction of the middle and lower thirds of the curved line connecting TB17 (Yifeng) and TB20 (Jiaosun). The classics describe it as being located among the 'chicken-foot' like blue vessels behind the root of the ear.

What is TB18 used for?

TB18 calms fright and extinguishes wind, clears the head and benefits the ears, harmonizes the stomach and intestines. Common clinical indications include head wind, tinnitus, infantile convulsions, epilepsy, tetany, vomiting, diarrhea, fright, fear, blurry vision, unclear vision.

How is TB18 needled?

Subcutaneous insertion 0.3-0.5 cun, often directed inferiorly or superiorly along the channel. Caution: The Jia Yi Jing states that excessive bleeding can be fatal. The Zhen Jiu Ju Ying echoes this, saying not to let out too much blood.

Which meridian is TB18 on?

TB18 is a point on the Triple Burner Meridian (Sān Jiāo).

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⚠️ This page is for general education and is not medical advice. Acupuncture is a traditional practice; evidence varies by condition and study quality, and individual results differ. It does not replace diagnosis or treatment by a licensed professional. Always consult a qualified acupuncturist or physician.